"Macbook Pro" is the whole product name whereas "in-law" is effectively an adjective on father. But I don't think grammar is quite the point. :)
But people shorten it to "MacBook", and "Pro" is short for "professional". So "MacBook Pros" logically expands to MacBook Professionals (which makes me think of the Genius Bar). Anyway, I seem to be in the minority.
He, I shorten it to pro because I own a Macbook.
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